Javascript 为什么是'；这'；参考'；窗口'；在这个类型脚本片段中？

鉴于此件代码：

module movieApp {
    export interface IHomeControllerScope extends ng.IScope {
        moviesToDownload: string[];
        active: string;

        deleteMovieFromDownloadList(movie: any);

        markMovieAsDownloaded(movie: any);
    }

    export class HomeController {
        public static $inject = [
            '$scope',
            '$location',
            'MovieService'
        ];

        constructor(private $scope: IHomeControllerScope, private $location: ng.ILocationService, private MovieService) {
            this.$scope.$on('$locationChangeSuccess', (event) => {
                this.setActiveUrlPart();
            });

            MovieService.getMoviesToDownload().then(response => {
                this.$scope.moviesToDownload = response;
            });
        }

        private setActiveUrlPart() {
            var parts = this.$location.path().split('/');
            this.$scope.active = parts[1];
        }

        public get moviesToDownload() {
            return this.$scope.moviesToDownload;
        }

        public markMovieAsDownloaded(movie: any) {
            movie.Downloaded = true;
        }

        public deleteMovieFromDownloadList(movie: any) {
            this.MovieService.deleteMovieFromDownloadList(movie).then(() => {
                debugger;
                this.$scope.moviesToDownload = _.without(this.$scope.moviesToDownload, movie);
            });
        }
    }
}

app.controller("HomeController", movieApp.HomeController);

一切正常，但在

this.$scope.moviesToDownload=\uu.without（this.$scope.moviesToDownload，movie）行中的方法
deleteMovieFromDownloadList

，

此

指的是窗口对象，而不是我期望的实际对象

生成的JavaScript如下所示：

var movieApp;
(function (movieApp) {
    var HomeController = (function () {
        function HomeController($scope, $location, MovieService) {
            var _this = this;
            this.$scope = $scope;
            this.$location = $location;
            this.MovieService = MovieService;
            this.$scope.$on('$locationChangeSuccess', function (event) {
                _this.setActiveUrlPart();
            });

            MovieService.getMoviesToDownload().then(function (response) {
                _this.$scope.moviesToDownload = response;
            });
        }
        HomeController.prototype.setActiveUrlPart = function () {
            var parts = this.$location.path().split('/');
            this.$scope.active = parts[1];
        };

        Object.defineProperty(HomeController.prototype, "moviesToDownload", {
            get: function () {
                return this.$scope.moviesToDownload;
            },
            enumerable: true,
            configurable: true
        });

        HomeController.prototype.markMovieAsDownloaded = function (movie) {
            movie.Downloaded = true;
        };

        HomeController.prototype.deleteMovieFromDownloadList = function (movie) {
            var _this = this;
            this.MovieService.deleteMovieFromDownloadList(movie).then(function () {
                debugger;
                _this.$scope.moviesToDownload = _.without(_this.$scope.moviesToDownload, movie);
            });
        };
        HomeController.$inject = [
            '$scope',
            '$location',
            'MovieService'
        ];
        return HomeController;
    })();
    movieApp.HomeController = HomeController;
})(movieApp || (movieApp = {}));

app.controller("HomeController", movieApp.HomeController);
//# sourceMappingURL=HomeController.js.map

var myController = new HomeController();
someFramework.doSomethingWithCallback(myController.deleteMovieFromDownloadList);

如您所见，在生成的JS中，特定方法使用了_this。这看起来不错，对吧

有人能给我解释一下发生了什么以及如何解决这个问题吗

编辑：

我将其与角度测量结合使用：

编辑二：

---

在尝试了所有的建议，然后将我在这里发布的原始代码放回原处后，一切正常！我不知道怎么做，但我想这与Chrome/VS2013有关。无论如何，感谢那些试图帮助我的人。

我猜问题在于如何调用

deleteMovieFromDownloadList

。如果您这样做：

var movieApp;
(function (movieApp) {
    var HomeController = (function () {
        function HomeController($scope, $location, MovieService) {
            var _this = this;
            this.$scope = $scope;
            this.$location = $location;
            this.MovieService = MovieService;
            this.$scope.$on('$locationChangeSuccess', function (event) {
                _this.setActiveUrlPart();
            });

            MovieService.getMoviesToDownload().then(function (response) {
                _this.$scope.moviesToDownload = response;
            });
        }
        HomeController.prototype.setActiveUrlPart = function () {
            var parts = this.$location.path().split('/');
            this.$scope.active = parts[1];
        };

        Object.defineProperty(HomeController.prototype, "moviesToDownload", {
            get: function () {
                return this.$scope.moviesToDownload;
            },
            enumerable: true,
            configurable: true
        });

        HomeController.prototype.markMovieAsDownloaded = function (movie) {
            movie.Downloaded = true;
        };

        HomeController.prototype.deleteMovieFromDownloadList = function (movie) {
            var _this = this;
            this.MovieService.deleteMovieFromDownloadList(movie).then(function () {
                debugger;
                _this.$scope.moviesToDownload = _.without(_this.$scope.moviesToDownload, movie);
            });
        };
        HomeController.$inject = [
            '$scope',
            '$location',
            'MovieService'
        ];
        return HomeController;
    })();
    movieApp.HomeController = HomeController;
})(movieApp || (movieApp = {}));

app.controller("HomeController", movieApp.HomeController);
//# sourceMappingURL=HomeController.js.map

var myController = new HomeController();
someFramework.doSomethingWithCallback(myController.deleteMovieFromDownloadList);

…

someFramework

将在不将回调绑定到预期上下文的情况下调用回调。如果是这种情况，可以通过执行以下操作进行修复：

var boundCallback = myController.deleteMovieFromDownloadList.bind(myController);
someFramework.doSomethingWithCallback(boundCallback);

更新：

在阅读Angular文档时，您在click处理程序中输入的似乎不是真正的JavaScript，而是Angular解释的。因此，可能

homeCtrl.deleteMovieFromDownloadList（m）

本质上是这样做的：

var fn = homeCtrl.deleteMovieFromDownloadList;
fn(m):

…这当然不会正确设置

控制器设置好了，你就不能这样做吗

data-ng-click="deleteMovieFromDownloadList(m)"

“deleteMovie…”函数可能绑定到按钮或其他UI元素。在这种情况下，此函数在窗口上下文中执行。要解决此问题，应在控制器的构造函数中定义函数体：

constructor(private $scope: IHomeControllerScope, private $location: ng.ILocationService, private MovieService) {
// other initialization code...

this.deleteMovieFromDownloadList = (movie: any) => {
    this.MovieService.deleteMovieFromDownloadList(movie).then(() => {
        debugger;
        this.$scope.moviesToDownload = _.without(this.$scope.moviesToDownload, movie);
    });
  }
}

并在控制器类中声明适当的函数：

deleteMovieFromDownloadList: (movie: any) => void;

Javascript在构造函数时有一些奇怪的行为。我举了一个例子来说明它是如何工作的：

function myClass() {
    var me = this;
    this.property = 'test';
    this.windowObj = function() {
        windowObjTest();
    }

    var windowObjTest = function() {
        console.log(this); // this = window object
    }

    this.myself = function() {
        myselfTest();
    }

    var myselfTest = function() {
        console.log(me); // me = this object
    }
}

var myobj = new myClass();
myobj.windowObj();
myobj.myself();

this.windowObj（）
是一个公共函数，用于调用私有函数
windowObjTest（）。在私有函数中，
这个
是对窗口对象的引用，而不是对这个实例的引用（别问我，dev很高或者其他什么…）。要将当前对象的引用获取到私有函数中，必须将当前对象的引用设置到构造函数中：
var me=this

试试这个例子，看看控制台。应出现两个条目：

- Window test.php //console.log(this);
- myClass { property="test", windowObj=function(), myself=function()} //console.log(me);

“deleteMovie…”函数可能绑定到按钮或其他UI元素。在这种情况下，此函数在窗口上下文中执行。要解决此问题，您应该在控制器的构造函数中定义函数体：this.deleteMovieFromDownloadList=（movie:any）=>{this.MovieService.deleteMovieFromDownloadList（movie）。然后（（）=>{debugger；this.$scope.moviesToDownload=41;不带（this.$scope.moviesToDownload，movie）；}）；}我总是在构造函数中移动这样的函数。我确信这是解决TypeScript控制器中“this”问题的最简单的方法。谢谢，但不行，因为该方法不在
$scope
上。这就是我使用
ControllerAs
语法的原因。谢谢，我对这一点很熟悉。正如您在生成的JS代码中所看到的，它已经做到了您所暗示的：
var\u this=this\u this
。我不确定在这种情况下这是否正确。您必须在类构造函数中设置_this=this才能使用它，而不是私有函数
HomeController.prototype.deleteMovieFromDownloadList
。在这里，您可以用窗口对象覆盖它。我认为这是正确的，因为在调试器中，我可以看到当调用
\u this=this
时，
this
引用了正确的对象。您也可以使用lambda外部控制器声明函数：
deleteMovieFromDownloadList=（movie:any）=>{…}